My own answer to this question last year came in the form of
https://github.com/hiAndrewQuinn/til, which is just a messy list of Markdown files. The lowest-effort thing I could think of. That messy list gets built into an actual website by the
https://github.com/hiAndrewQuinn/til-site repo, which you can see at
https://hiandrewquinn.github.io/til-site/.
I used your plight, and your catchy name, as inspiration to abstract this pattern out into a new software project. I hereby present to you, the first, bleeding-edge draft of Rabbitholer: https://github.com/Siilikuin/rabbitholer
Thank you for being my muse! I've wanted to scratch this itch for a long time now.
I don't have a good answer for SEO yet, beyond "pick words good and people will find it". But that gets easier and easier with practice.